Sedimentary (Primary) With Artificial Modification

Dyed Blue Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Agate (Dyed Purple)

Agate (Variety of Chalcedony/Quartz), SiO2

Tumbled blue-green chalcedony (likely dyed agate or chrysoprase)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Copper-bearing rock, likely bornite/chalcopyrite in iron-rich matrix

Chalcopyrite (CuFeS₂) and/or bornite (Cu₅FeS₄) in limonite/goethite matrix

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Pink Dyed Agate (Banded Chalcedony)

Silicon dioxide (SiO2) - variety Chalcedony

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Iridescent bismuth crystal

Bismuth (Bi), artificially crystallized

Bismuth crystal

Bismuth (Bi), artificially crystallized

Dyed Blue Agate Druzy Pendant

Quartz / Chalcedony (SiO2) with artificial color treatment

Rainbow Quartz (Dyed/Coated Quartz)

Silicon Dioxide (SiO2) with artificial color enhancement

Dyed Pink Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial dye additives

Tumbled yellow calcite

Calcite (CaCO₃), likely honey/yellow calcite

Likely black beach pebble

Undetermined; possibly basalt, chert, or dark slate

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Banded Slag Glass (Leland Blue/Frankfort Green style)

Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)

Blue Lace Agate

Chalcedony (SiO2) with trace impurities

Lemon Quartz

Silicon Dioxide (SiO2)

Aura Agate

Silicon Dioxide with metal coating (SiO2)

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Druzy chalcedony pendant, likely coated or dyed

Microcrystalline quartz (SiO₂), chalcedony with druzy quartz; surface may have titanium or metallic coating

Quartz

Silicon Dioxide (SiO2)

Galena

Lead Sulfide (PbS)

Clear Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide, Fe2O3

Quartz Crystal Cluster / Quartzite

Silicon Dioxide (SiO2)

Quartz Boulder

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz (Raw Specimen)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Pink / Ferruginous)

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)